Weston 9.0 compatibility changes

Weston 9.0 compatibility changes

Changes:
- Bump libweston dependencies in meson.build
- Match weston_compositor_tear_down -> weston_compositor_destroy API
  change by following what was done in weston for 9.0
- Update log context code to match API changes, based on what was
  done in weston for 9.0
- Update transform names to match weston
- Initialize a couple of structure fields to avoid failure from
  -Werror=missing-field-initializers triggered by changes in newer
  wayland.

Bug-AGL: SPEC-3819

Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Change-Id: I48fab590eb59a1b83b0cebc3762ba730450b0e3a